Evening Primrose Oil

**Semantic type:** Substance

**Definition:** An oil extracted from the seeds of the plant Oenothera biennis, a North American native biennial branching shrub with small yellow flowers. The oil contains the fatty acids linoleic acid and gamma-linolenic acid (GLA), a rare essential fatty acid.

**Synonyms:** - Common Evening Primrose - EVENING PRIMROSE OIL - Fever Plant - Great Evening-Primrose - King's-cure-all - Night Willow-herb - Scabish - Scurvish - Tree Primrose